Actuator



FIG. 1 is a frontal, downward, rightward perspective view of an actuator showing my design thereof;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a top plan view thereof.

Portions of the actuator shown in broken lines in the figures are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an actuator, as shown and described. 